CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
When you’re focusing on your BCMSN Examination on your way to CCNP certification, you’ll go through at size regarding how Cisco routers and multilayer switches can operate to provide router redundancy – but there’s One more useful provider, Server Load Balancing, that does the identical for servers. While HSRP, VRRP, and CLBP all characterize many Bodily routers to hosts as a single Digital router, SLB signifies various Bodily servers to hosts as only one Digital server.
In the subsequent example, three Bodily servers happen to be placed into the SRB team ServFarm. They’re represented to the hosts as the virtual server 210.1.one.14.
The hosts will search for to talk to the server at 210.one.1.fourteen, not understanding they’re essentially speaking While using the routers in ServFarm. This allows brief cutover if one of the physical servers goes down, and in addition serves to cover the actual IP addresses of your servers in ServFarm.
The fundamental operations of SLB entails making the server farm, followed by producing the virtual server. We’ll initially incorporate 210.one.1.11 to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.one.11
MLS(config-slb-serious)# inservice
The first command results in the server farm, with the real command specifying the IP tackle of the real server. The inservice command is required by SLB to think about the server as Prepared to deal with the server farm’s workload. The real and inservice commands need to be repeated for every server during the server farm.
To make the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.1.1.fourteen
MLS(config-slb-vserver)# inservice
From your 토토사이트 top rated down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The Digital server is assigned the IP address 210.1.1.fourteen, and connections are permitted as soon as the inservice command is applied.
You may additionally want to regulate which of the network hosts can hook up with the Digital server. If hosts or subnets are named While using the client command, Those people would be the only clients that can hook up with the Digital server. Be aware this command employs wildcard masks. The subsequent configuration would let only the hosts to the subnet 210.one.1.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# consumer 210.one.1.0 0.0.0.255
SLB could be the server conclusion’s response to HSRP, VRRP, and GLBP – but you continue to have to know it to be a CCNP! Figuring out redundancy strategies and protocols is important in nowadays’s networks, so you should definitely’re at ease with SLB right before taking up the Test.